header nav[data-desktop-nav] {
  display: flex;
}
header [data-burger] {
  display: none;
}

@media (max-width: 1239px) {
  header nav[data-desktop-nav] {
    display: none;
  }
  header [data-burger] {
    display: inline-flex;
  }
}
[data-er-menu] a {
  text-decoration: none;
}